Build emacs with a dark title bar on mac

emacs_natural_title_bar.patch

diff --git a/src/nsterm.m b/src/nsterm.m
index b03ad52621..edc77adfc0 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -6744,6 +6744,9 @@ - (BOOL)isOpaque
     [win setCollectionBehavior:NSWindowCollectionBehaviorFullScreenPrimary];
 #endif
 
+  win.titlebarAppearsTransparent = true;
+  win.appearance = [NSAppearance appearanceNamed:NSAppearanceNameVibrantDark];
+
   wr = [win frame];
   bwidth = f->border_width = wr.size.width - r.size.width;
   tibar_height = FRAME_NS_TITLEBAR_HEIGHT (f) = wr.size.height - r.size.height;